ok, gunfighter, no problem. Believe me, I'm not saying that the Saiga is a BAD choice for home defense or 3-gun, but IMO, not as good of a choice - So I do in fact have to take further issue with several things you said:
Shows the Saiga S-12 as weighing 3.6 kg. or 7lb. 15 oz.
Shows the 18" Rem. 1100 as 3.6kg. or 7lb. 15oz.
True enough that the base models are the same weight, but *IF* (and granted, that's a big if) you want to run with an ESD (dot sight), then they become much heavier, because even the lightest aluminum mount that goes on the side plate is much heavier than a mount which would be installed on a "standard shotgun.
The trigger can be smoothed/touched up --- mine has a very nice pull of about 5lbs. with no creep etc.
My Saiga trigger was quite simply not nearly as good as a "standard" shotgun - it was both "longer" (more travel) and a bit heavier. Not as crisp either. Sure you could pay money to smooth it up or do it yourself, but that's still a disadvantage, because then you have to spend time and/or money.
Awkward ?? No more awkward then the M1A , AR15 , FAL etc. etc.
Very true. Not any more awkward than the ones you mention. But that's not what we're comparing it to - we're comparing it to non-detachable mag fed shotguns. Red herring/straw man.
Saiga S-12 expensive to accessorize , YES it is -- price is about the same as ANY custom firearm.
First not true, I don't think - the Saiga accessories cost a lot more, in part because there are not millions of them out there like brownmossremchester. Second, even if that were true (same expense to customize), the Saiga NEEDS accessorizing more so than "standard" shotguns, due to their poor ergos from the factory. So it's like buying a bill to pay, since very few people are going to shoot them as is, and even fewer are going to shoot them WELL as is.
Factory sights are "off" --- not on mine or the other dozen I fired and the other 20/30 I have seen/handled.
Well, ok, not on the 30 you handled, but on the ONE I had (which is the ONLY one that mattered to me), they were way off. So again, I was buying a bill because I would have had to find a taller front sight and get it installed. The pattern was centered 10-12" higher than the line of sight - couldn't even hunt turkeys with it like I wanted to for that reason. So you're buying at least a CHANCE of a lemon like mine, at a much higher chance than getting a lemon with a brownmossremchester.
S-12 sights are high to the bore line --- YES,they are. Which is a reason the S-12 has a softer recoil,IMHO.
Hmmm, ok, I'll give you that one!
So there's both an upside and a downside to the higher line of sight - to me, the downside outweighs the upside.
A disadvantage when shooting prone ?? Yes , it COULD be. And the same can be said for any BOTTOM fed mag weapon -- no Military longarm that I know feeds from the side or top like a Bren etc.
Right. But again, we're comparing the Saiga to a NON-bottom-fed weapon - a Mossberg with a tube mag.
With a 5rd. mag , the S-12 is about 4 inches "deeper" then a tube fed SG. ---- not a lot of going prone in a HD situation and with just tilting the S-12 on to the left side a bit or useing your elbows , not much of a disadvantage IMHO.
With a 5 round mag, you're not getting the true advantage offered by the gun in the first place. When using a 10-rounder, as most people will, or the 8-rounder, or a drum, it definitely intereferes! (well maybe not the 8-rounder - not sure on that one).
I've been shooting IPSC , 3 Gun etc for a VERY long time {USPSA#L937} and the S-12s are showing up more and more --- they also put you into Unlimited/Open Class -- reason being they are so fast to reload etc.
I'll give you that, too - the reloading time factor is HUGE, and that one huge factor *may* overcome the many disadvantages I've outlined to some people. But not to me, and I don't think to most others. But if three or four of the top five 3-gunners at the finals at nationals all use Saigas at some point, then I'm sure I'd change my tune!
The Saiga *may* be faster-cycling as well (I'm not sure). But it's very very fast - I could rip off 10 in an incredibly short amount of time. But I never tried with with a tube-fed semi-auto, so have no basis of comparison.